Lodash _.firstExisting() Method

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The Lodash _.firstExisting() method returns the first existing argument from the arguments list.

Note: If the first argument is not exist like null or undefined, this method ignores that argument and checks for next.

Syntax:

_.firstExisting(arg1, arg2,....,argn);

Parameters: This method takes n arguments to check for the first existing argument.

Return Value: This method returns the first existing arguments.

Note: This will not work in normal JavaScript because it requires the lodash.js contrib library to be installed. Lodash.js contrib library can be installed using npm install lodash-contrib.

Example 1:

Javascript

// Defining underscore lodash variable  
var _ = require('lodash-contrib');  
  
var f_exist = _.firstExisting("gfg", "abc", 0, 1); 
    
console.log("First Existing value is : ", f_exist);

Output:

First Existing value is : gfg

Example 2:

Javascript

// Defining underscore lodash variable  
var _ = require('lodash-contrib');  
  
var f_exist = _.firstExisting(null,  
        undefined, "gfg", "abc", 0, 1); 
    
console.log("First Existing value is : ", f_exist);

Output:

First Existing value is : gfg

Example 3:

Javascript

// Defining underscore lodash variable  
var _ = require('lodash-contrib');  
  
var f_exist = _.firstExisting( 1, 2, 2, 3, 3, 4 ); 
    
console.log("First Existing value is : ", f_exist);

Output:

First Existing value is : 1

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